Shock absorber for oil-well pump rods



March 18, 1930. C. BAKER l 1,750,917"

SHOCK ABSORBER FOR' OIL WELL PUMP RODS Filed oct. 5, 19'28 2 sheets-sheet 1 March 18, 1930. F. c. BAKER SHOCK ABSORBER FOR OIL WELL PUMP RODS 2 Sheets-Sheet 2 Filed oct. 5, 1928 Patented Mar. 1S, 1930 viren raras sHocK ABSORBER Fon in-.WELL PUMP ,rions4 Application led October 5, 1928. SerialA 1\To. 310,633. i

This invention relates to new and useful improvements in shock absorbers, and particularly to shock absorbers which are adapted for use in connection with oil well pump rods.

One object of the invention is to provide a shock absorber, of improved construction, which will readily absorb the shocks incident to the reoiprocations of the walking beam.

Another object is to provide a device of this character wherein proper lubrication is given to the moving parts, and to the springs within the device, thereby greatly lengthening the life of the springs, and insuring the efficient operation of the device.

A further object is to provide a device of this character wherein the parts are so constructed and arranged as to insure the proper alinement thereof, while at work.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

In the drawing:

Figure 1 is an elevation of a shock absorber made in accordancer with the present invention.

Figure 2 is an enlarged vertical longitudinal sectional view through the device.

Figure 3 is a horizontal sectional view on the line 3-3 of Figure 1. y

Figure 4 isan elevation of a double shock absorber.

Figure 5 is a vertical sectional view of the device shown in Figure 4.

Figure 6 is a horizontal sectional view on the line 6-6 of Figure 5.

Referring particularly to the accompanying drawing, 10 represents a metal shell which has its upper end open, and has the upwardly extending central boss 11, in the bottom wall thereof, suoli boss lying within the shell. Cast in diametrically opposite sides of the shell, and extending throughout the entire length of the shell, are the tapered bores 12, within which are secured the ends of the rope or cable bail 13, such rope being held in the bores by means of Babbitt metal. Disposedwithin the shell, and receiving the boss 11 within its lower coils, is a coil spring Cal 14,',and 'disposed inl concentric -relation outwardly of the spring 14, within the shell, is a slightly larger spring 15,the lower' ends of bothof said springs resting on the bottom wall of the sl1ell.Disposed`in the upper end of the shell 10 is ak hollow bloclr or follower' 16, said block having a downwardly extending hollow boss 17 extending from the center of its lower end and lying within the upper end coils of the 'spring 14. The upper wall of the block is provided vwith an opening 18 which alines with the opening through the boss 17, to receive. the-polish rod 19 therethrough, said rod also passing upwardly through the lower boss 11,*as clearly seen in the sectional View, Figure 2. Secured on'tlie polish rod 19, above the'block `16, isacollar or clamp 20, which serves to maintainfthe block in proper contact with the upper-.ends of the springs 14 and 15, whereby said springs are maintained under a certain degree of compression', and whereby the-block is held partly within the upper end of the shell. AThe upper, or closed portion of the bail 13 is engaged over an end of the walking-beam 21, while the lower end of the rodv1'9 extends into the L well casing, not shown, but which will be readily understood. l The shell is filled withnoil, so that'the springs 14 and 15 are completelysubmerged,

whereby tomaintain-said springs in proper Condition, and to prevent collapse o'r going dead thereof; Also, somerof the oil will be splashed into ythe boire ofthe bossll, and into the bore of the boss 17, whereby t'o insure the proper lubrication of the rod 19, and the smooth `movement thereof through the parts with whichit is associated.

f From the foregoing-.it will readily Ybe seen that, when the end vof 'the walking-beam 21 moves upwardly, the shell 10 will be lifted, through the medium of the bailf13, the weight ofthe rod 19, and the 'expansive resistance of the springs 14 and 15 serving to prevent a sudden upward jerk on the rod;

Where a Well is of great depth, a double shook absorber is used, such as illustrated in Figures 4, 5, and 6. In this construction there is provided a double-barreledv casing, which includes the two parallel cylinders 22,

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1 4 Y, V- i V1,750,917'

connected by the intermediate neck portion V23, such neck portion being hollow whereby i to establish communication between the cyl-V V inders. e Rising` fromthe center of the bottom v 5 wall of the neck portion 23 is a hollow boss 24C, through which the polish rod is slidably disposed Disposed in each of thecylinders Y are the; pair ofi coil springs 26 and '27',I the latter being slightly smaller than the former 10 and disposed concentrica-lly 'therewithin Disposed in the vupper portionto'thecasing is the hollow follower 4block 28,*said block .lhaving the circular portions-129 arranged Y Vtoslide'vertically within'the respectivecyle '15inders, and` bearing on the upperends of said springs, said: portions 29'ea 'chl being formed f withv a :depending projection or boss- 30 receiving, theuppen-ends of the- 'springs4 n 'The' outersidesoff the cylinders are formed 20 with' the longitudinal bores 31, kreceivingfthe endszofthe cable bail32, saidbail having its bightportion adapted for proper connection f wit-hz-a'n endoi'awwalkingbeamz,ina manner similar to'`v` that. show-njinry connection with the l f 26 iirsti form oftheshock absorber.-

I The cylinders,together withxthe neck por. tion ofthe' casiing-,A are lilled-Withfvoil, whereby thefsprin'gs aref completely submerged therve-V in,Y theboss- 241fbeing', of: such a height as to y fw maintain the-oil at theffdesiredflevel therein; The-upper end of thefpolishf rod, above the follower blook,; is: providedl with? a clampl 33,*Y which@ is arrangedvtofbear onA thev upper face ot saidfblock; wherebyto'urge Vthe same down'- wardlmagainst thel tension ot `the'fsprings,`

forthe'purp ose ot absorbing the j ar and shockincident toithe liftingo thetwell'tool as well n as''thelow'ering'thereof;v Y Q y vYllhat-isfclaim'edisi'z' j U- .40" shock absorben for an oilWelllpumperod comprisiingg;av lubricant containingpshell-hav;

- ing its* upper endv open: andy havinglan up= Y wardly extending hollow besson itsbottom v wall. fion' maintaining; the' lubricant ata pref ai determinedlevel and for receiving' af polish I rodf therethrough\Al a followeriblockin the Y il upper perr` endf oftheshelland having' a. 'l downwardly extending hollowfboss" Von its y i Y v lower end: concentric?A coil-'1springs,l disposed'- within tlie'shellgthe'inn'er off the; springs receivinge ther said' bosses in' itsyopposite ends, tl'i'efshell having-Slongitudinal1Y taper-ing?` bores, n in its opposite sides;ind2aacable'inithe:form off/fa; baildis'pose'dabove thefshell andfhaving K 4 its ends.wedgiiglylsecuredfwithin said longi- Y' tu'dinaltapered bores; i

' testimony whereolj affix my7 signature:

f BAKER. 

